Overlapping receptive fields.

<p>Figure shows the effect of increasing the overlap of the receptive fields (to ) of the Place Cells. Panel A shows a configuration without lateral connections and panel B shows a configuration with lateral connections (and corresponds to systems A and B from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g003" target="_blank">Figures 3</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g004" target="_blank">4</a>). The plots of the average reward (left column, solid line) are calculated in exactly the same way as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g003" target="_blank">Figure 3</a> shown over 9 blocks of 512 trials, rather than 5. The red dashed line shows the values from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g003" target="_blank">Figure 3</a> over 9 blocks for direct comparison. We can observe that the system without lateral connections is less affected by the increase of the parameter than the system with lateral connections. The plots of the gradient (right column) are produced as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g003" target="_blank">Figures 3</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0018539#pone-0018539-g004" target="_blank">4</a>, by plotting the sum of the potential weight change (calculated in the same way as in previous figures).